π型接线高压电容器组不平衡电流离线测试方法  

Off-line Test Method for Unbalanced Current of High Voltage Capacitor Bank as π Type Structure

作　　者：雷战斐 史磊 耿池勇 吴鹏 LEI Zhanfei;SHI Lei;GENG Chiyong;WU Peng(Maintenance Company of State Grid Ningxia Electric Power Company,Yinchuan 750011,China;State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan 750011,China;Shenzhen Hengdong Electric Co.,Ltd.,Guangdong Shenzhen 518116,China)

机构地区：[1]国网宁夏电力有限公司超高压公司,银川750011 [2]国网宁夏电力有限公司,银川750011 [3]深圳市恒东电气有限公司,广东深圳518116

出　　处：《电力电容器与无功补偿》2024年第2期14-19,共6页Power Capacitor & Reactive Power Compensation

基　　金：2021年度宁夏回族自治区自然科学基金项目(2021AAC03495)。

摘　　要：国内交、直流滤波器电容器组一般采用H桥型结构,但某些换流站采用π型结构电容器组,H桥型电容器组不平衡电流离线测试方法不再适用。本文提出将π型结构电容器组构成H桥型间接测量不平衡电流的新方法,分别对电阻、电容和电感3种构成H桥的方法进行计算公式推导和仿真分析。为减小现场电磁干扰对测量精度的影响,本文采用多频率点测试不平衡电流的方法进行现场测试,结果表明新方法理论思路正确,可以准确测量不平衡电流。AC and DC filter capacitor banks in China generally use H-bridge structure,but some converter stations use π-type structure capacitor banks,and the off-line test method for unbalanced current of H-bridge capacitor banks is not applicable any longer.In this paper,a new method of indirectly measuring unbalanced current is proposed by forming a π-type capacitor bank into an H bridge.And the method derives the calculation formula and simulates such three methods of forming the H bridge as resistance,capacitance and inductance.For reducing the influence of on-site electromagnetic interference on the measurement accuracy,the method of testing unbalanced current at multiple frequency points is used for on-site testing.The results show that the theoretical idea of the new method is correct and can accurately measure unbalanced current.

关 键 词：π型电容器组 电阻桥臂 不平衡电流 

分 类 号：TM53[电气工程—电器]